<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="https://www.baidu.com/s">
        <input type="text" 
        name="wd" 
        id="username"
        >
        <button>search</button>
        // 提交， 请求
        // 
    </form>

    <form action="https://search.jd.com/search">
        <input type="text" name="keyword" id="keyword">
        <button>search</button>
    </form>

    <form action="">
        账户： <input type="text" name="account" value="666">
        <br>
        密码： <input type="password" name="pwd">
        <br>
        性别： <input type="radio" name="gender" value="mele"> 男
        <input type="radio" name="gender" value="femele"> 女
        <br>
        爱好： <input type="checkbox" name="hobby" value="sport"> 运动
        <input type="checkbox" name="hobby" value="read"> 阅读
        <textarea name="other" id=""></textarea>
        <br>
        <select name="place" id="">
            <option disabled value="beijing">北京</option>
            <option value="shanghai">上海</option>  
            <option value="guangzhou">广州</option>
        </select>
        <button>登录</button>
    </form>

</body>
</html>